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Sun, Jun 17, 2018 10:14 pm

Firefox reporting "Your connection is not secure" for sites

I upgraded Firefox on a Linux system running CentOS 7 to version 52.8.0-1 with yum upgrade firefox. When I opened Firefox afterwards and put in the address bar, I saw the message below:

Your connection is not secure

The website tried to negotiate an inadequate level of security.

uses security technology that is outdated and vulnerable to attack. An attacker could easily reveal information which you thought to be safe. The website administrator will need to fix the server first before you can visit the site.


When I went to another site,, using HTTPS, I saw the same message. I checked to ensure that the web browser wasn't configured to use a proxy by clicking on the icon with the three horizontal bars at the top, right-hand side of the browser window and selecting Preferences, then Advanced, then Network, then Settings. The setting was "No proxy." I then right-clicked on the "Your connection is not secure" page and chose View Page Info. When I clicked on the Security tab, I saw the "Owner" value listed as "This website does not supply ownership information." In the Technical Details section, I saw "Connection Not Encrypted" and "The website does not support encryption for the page you are viewing," even though the URL listed was

[ More Info ]

[/network/web/browser/firefox] permanent link

Sun, May 27, 2018 9:13 pm

Centering divs with flex-container

With HTML 4, centering the contents within a div is simple. You just use <div align="center">. E.g., if I wanted to center the image and text below on a webpage, I could use the following code:

<div align="center">
<img src="186px-Antinous_Mandragone_profil.jpg" alt="Antinous Mangragone 
<a href="">
Antinous Mandragone</a>

The image would then be displayed in browsers as seen below:

Antinous Mangragone profile
Antinous Mandragone

[ More Info ]

[/network/web/html/css] permanent link

Sun, Feb 18, 2018 10:10 pm

Displaying a tooltip

A tooltip, aka infotip or hint, is a small box of text that appears when a user hovers the mouse pointer over an item, such as a particular word or phrase, on a webpage. If you wish to display a tooltip when a user hovers the mouse pointer over text on a webpage, there are a number of ways you can do so. The simplest way to do so is to specify a title attribute, which is an HTML global attribute with the span tag. E.g.:

<span title="This is the tooltip text to be displayed when the mouse is hovered over the spanned text.">example text</span>

This is an example using the above technique with example text.

[ More Info ]

[/network/web/html] permanent link

Mon, Jan 22, 2018 5:26 pm

This page intentionally left blank

Books and other documents may often include pages intentionally left blank stating "This page [is] intentionally left blank." As explained in the Wikipedia intentionally blank page article, this is often done due to the way pages are printed from a much larger sheet of paper or for legal reasons. On the web you can find an online equivalent in The This Page Intentionally Left Blank (TPILB) Project which notes:

In former times printed manuals had some blank pages, usually with the remark “this page intentionally left blank”. In most cases there had been technical reasons for that. Today almost all blank pages disappeared and if some still exist here and there, they present flatterly comments like “for your notes” instead of the real truth: This page intentionally left blank!

Nowadays the “This Page Intentionally Left Blank”-Project (TPILB-Project) tries to introduce these blank pages to the Web again. One reason is to keep alive the remembrance of these famous historical blank pages. But it is the primary reason to offer internet wanderers a place of quietness and simplicity on the overcrowded World Wide Web—a blank page for relaxing the restless mind.

Since I sometimes want to take browser screenshots that display options that are available in various browsers, but would prefer not to have any webpage content displayed in those screenshots, I've also created a this page intentionally left blank" page.

[/network/web/design] permanent link

Tue, Dec 05, 2017 10:53 pm

Determining if a site has implemented HTTP Strict Transport Security (HSTS)

HTTP Strict Transport Security (HSTS) is a security mechanism used by some websites to ensure that HTTP Secure (HTTPS) is always used by visitors to the site even should some intermediate system between the visitor's browser and the website attempt a man-in-the-middle (MITM) attack to downgrade the communications protocol to the unencrypted Hypertext Transfer Protocol (HTTP). The HSTS specification was published as Request for Comments (RFC) 6797 on November 19, 2012. You can tell whether a site has implemented HSTS by establishing a telnet connection to port 80, the well-known port for HTTP connections. E.g.:

$ telnet 80
Connected to
Escape character is '^]'.

HTTP/1.1 301 Moved Permanently
Date: Wed, 06 Dec 2017 02:56:57 GMT
Server: Apache
X-Frame-Options: SAMEORIGIN
Strict-Transport-Security: max-age=31536000; includeSubDomains
Connection: close
Content-Type: text/html; charset=iso-8859-1

Connection closed by foreign host.

[ More Info ]

[/network/web] permanent link

Fri, Nov 10, 2017 5:19 pm

Removing a site's cookies in Google Chrome 62

To remove cookies for a specific site in Google Chrome version 62, take the following steps:

  1. Put chrome://settings/siteData in the Chrome address bar where you normally place URLs which will show you a list of all the cookies stored on the system.
  2. In the "Search cookies" field, type the relevant domain name, e.g.,; you will then see only the cookies for that particular domain.
  3. Click on "REMOVE ALL SHOWN" to remove all of the cookies for the domain. You will then be warned "This will delete any data stored on your device for all the sites shown. Do you want to continue?" Click on the "CLEAR ALL" button to delete all of the cookies for the domain.

You can also go directly to the list of all the cookies associated with a particular domain by putting chrome://settings/cookies/detail?site= followed by the domain name in the address bar, e.g., chrome://settings/cookies/detail? You can then click on "REMOVE ALL" to delete all of the listed cookies for the domain.

Note: Tested with Google Chrome Version 62.0.3202.89 (Official Build) (32-bit) on a system running Microsoft Windows 7 Professional.

[ More Info ]

[/network/web/browser/chrome] permanent link

Tue, Sep 26, 2017 11:01 pm

Running the Chromium browser on a Linux system

Chromium is a free and open-source (FOSS) web browser that is very similar to the Google Chrome browser, though with some differences. Google started the Chromium project as a means to provide the source code for the proprietary Google Chrome browser. The Chromium Project is headed by Google developers with input from community developers.

If you wish to use the Chromium browser on a CentOS Linux system, you can install it by running the command yum install chromium from the root account. You can check if it is already installed on a CentOS system with rpm -qi chromium.

$ rpm -qi chromium
Name        : chromium
Version     : 60.0.3112.113
Release     : 2.el7
Architecture: x86_64
Install Date: Tue 26 Sep 2017 10:35:46 AM EDT
Group       : Unspecified
Size        : 106438445
License     : BSD and LGPLv2+ and ASL 2.0 and IJG and MIT and GPLv2+ and ISC and OpenSSL and (MPLv1.1 or GPLv2 or LGPLv2)
Signature   : RSA/SHA256, Tue 29 Aug 2017 08:00:23 AM EDT, Key ID 6a2faea2352c64e5
Source RPM  : chromium-60.0.3112.113-2.el7.src.rpm
Build Date  : Mon 28 Aug 2017 08:21:06 PM EDT
Build Host  :
Relocations : (not relocatable)
Packager    : Fedora Project
Vendor      : Fedora Project
URL         :
Summary     : A WebKit (Blink) powered web browser
Description :
Chromium is an open-source web browser, powered by WebKit (Blink).

[ More Info ]

[/network/web/browser/chromium] permanent link

Sun, Sep 17, 2017 11:09 pm

Determining the version of Microsoft Edge on a Windows system

You can obtain the version of the Microsoft Edge browser on a Windows system using the Get-AppXPackage cmdlet with Get-AppXPackage -Name Microsoft.MicrosoftEdge.

PS C:\> Get-AppXPackage -Name Microsoft.MicrosoftEdge

Name              : Microsoft.MicrosoftEdge
Publisher         : CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US
Architecture      : Neutral
ResourceId        :
Version           : 40.15063.0.0
PackageFullName   : Microsoft.MicrosoftEdge_40.15063.0.0_neutral__8wekyb3d8bbwe
InstallLocation   : C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe
IsFramework       : False
PackageFamilyName : Microsoft.MicrosoftEdge_8wekyb3d8bbwe
PublisherId       : 8wekyb3d8bbwe
IsResourcePackage : False
IsBundle          : False
IsDevelopmentMode : False
IsPartiallyStaged : False

PS C:\>

If you just want to see the version number and not the additional information, you can add "| select Version" at the end of the command.

PS C:\> Get-AppXPackage -Name Microsoft.MicrosoftEdge | select Version


PS C:\>

[/network/web/browser/edge] permanent link

Thu, Aug 24, 2017 11:01 pm

Firefox - Detect Captive Portal

When you start the Firefox web browser, it will attempt to determine if the network connection available to it when it starts is via a captive portal. If you use a hotel's Wi-Fi service, a free WiFi service provided by a restaurant or other business, or some other public WiFi service, when you first open your browser you may see a web page asking you to accede to terms of service, an acceptable use policy, or to provide some authentication information, e.g., perhaps your name and room number for a hotel, or to provide payment information if you are accessing a wireless service that is not free. You won't be able to go elsewhere on the web, at least not easily, until you deal with the demands/conditions specified on the captive portal page.

Firefox makes a determination on whether there is a captive portal constraint by attempting to download the file success.txt from (there is only one word in that file, the word "success". If it can successfully retrieve that file, it can assume that it is not constrained by a captive portal. You can see such attempts using the free and open-source (FOSS) Wireshark packet analyzer utility by specifying a filter of "http.request.method == "GET".

[ More Info ]

[/network/web/browser/firefox] permanent link

Tue, Aug 22, 2017 11:18 pm

Signing out of Amazon on a system with a low resolution display

Sometimes I encounter difficulties signing out of an account on Amazon's website when I need to sign into another account, if the resolution of the display isn't great enough to allow me to see the bottom of Amazon's list of choices where the sign out option appears. If I need to logon on such a system, there's no problem. If I visit Amazon's home page, I can click on "Hello. Sign in Accounts & Lists" where I see a "Sign in" button.

Amazon account and lists

[ More Info ]

[/network/web/shopping] permanent link

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